Improvement in saw-summing machine



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THOMAS S; DISSTO'N, or PHILADELPHIA, PENNSYLVANIA, ASSIeNoRv To HENRY DISSTON-or sans PLAGE.

Letters .Patent No. 73,239, datent January 14, 1868.

IMPROVEMBNv SAW-GUMMING MACHINE.

TO ALL WHOM IT MAY CONGERN:

Be it known that I, THOMAS S. Drs'sroN, of Philadelphia, Pennsylvania,` have invented an Improved Saw- Gumming Machine; andI do hereby declare the following to be a full, clear, and exact description of the same.

My invention consists of certain adjustable mechanism, fully described hereafter, for cutting the fronts of saw-teeth of any size. y

In order to enable others familiar with machinery of' this class to make and use myinveution, I will now proceed to describe its construction and operation, reference being had to the accompanying drawing, which formsa part of this specification, and in which'- Figure 1 is a sectional elevation gf my improved saw-gumming machine.

Figure'2 the same, with the operating parts in a different position.

Figure 3 is atransverse vertical section on the line 12, tig. 1.

Figure 4 a plan view, and i Figure 5 a detached sectional view'of a portion of the frame of the machine.

VSimilar letters refer to similar parts throughout the several views.

From the frame A of the machinepproject two long arms, a and a', between which is a narrow opening, b, extending upwards into the frame, and in cach of the said arms are set-screws c c.' Turning in annular projections oZ d on and forming a part of the frame A, are two disks, B and B', which are retained in their places by set-screwsg, which enter the grooves f of the disks, (see figs. Sand 5.) In each of the disks B and B is formed an opening or guide, t, in which is arranged to slide a. block, D, and each of the latter may be secured in any position in the said guides by a nut, z'. A spindle, F, passing through and turning in the blocks D, is provided with a crank-handled', and cutter-wheel, G. 0n the inner face of each of the disks B and B', are recesses 7c, and t, to which are adapted the forked ends of an arm, H, the two disks being turned simultaneously when the said arm is operated, in the manner described p hereafter. A rod, J, having a. notched end, Z,vph.sses through the frame A, andis secured to the same in any desired position, by a. set-screw, l; and a slotted plate,

im, through which the rod .T passes, is secured to the rear of the frame A by a. set-scrcw,p, (see figs. 1 and 2.)-

The arms a and a ofthe machine are passed over the circularsaw blade X, the centre of the semicircular front of thetooth y to besharpened is then accurately determined, and the machine adjusted until the centres ofthe disks B and B coincide with this centre, as shown in fig. 1, after which the machine'is secured to the saw-blade by tightening the set-screws c of the arms a and a. The forked ends of the arm H are then inserted into the recesses c or lc' ofthe disks, and the latter are simultaneously turned to about the position shown in iig. 1.

The next stage` of the operation is to adjust the cutter G, and bring it in contact `with the saw-tooth, which is done by loosening the nuts z', and moving the blocks D through the guides of the disks, until the cutter bears against the front of the tooth, as shown in fig.. 1; the nuts z' are then tightened to retain the cutter in this position. The crank-handlej is new turned, and the cutter begins to operate on the tooth, and at-the, same time the disks arc turned by means .of the arm H, thc cutter, 'as it is operated, being thus caused to follow the curve of thc tooth, until it arrives to the lposition shown in jig. 2. The rod J is now moved forward until its notched end Z is in contact with the point of the'tooth, and the plate mis brought in contact with the blade of the saw, as 'shown in figs. 1 and 2, after which the set-screws c are loosened, and the machineis removed to' the next tooth to be cut. The position of the machine in respect to the second tooth is determined by the rod J and plate m, which bear against the tooth and saw, as above described, and after cutting this tooth, the machin'e is removed, and`each tooth of the saw in succession is operated upon` in the .same manner, until the whole num` ber have been cut. Ihe'cxtreme points of the teeth inay then be sharpened by a-le or otherwise.

It will be evident that this machine possesses a great advantage over saw-gummers of ordinary construction, in which the cutter must fit the semicircular front of the tooth, whereas vin my machine, the cutter, as above described, is so adjusted andis so operated as to cut a saw-tooth of any siz'e.

I claim as my invention, and desire to secure by Letters Patent- 1. The rotary cutter Gr, arranged to revolve in disks adapted to and admitting of being turned in a suita-l ble frame secured to the saw, all substantially as described for the prupose specified.'

2.- The combination of the rotay cutter G, its bearing-blocks D D, a.dz:,pted to the movable disks B,lall substantially asand for the purpose herein set forth.

3. The rod J endered adjustable onthe machine', and hnvngnl notched end, adapted to the point of one of the teeth of the sam asset forth for the pui-.pose `described.

4'. The'i-ecesses 7c kf in the disksv B, Afor the reception ofA the forked end-of the. levcrH. In testimony whereof, I have signed my name to this specification in the presence of tw'o subscribing witnesses.

' THS. S. DISST-ON.

Witnesses:

J oHN WHITE, GHAS.- B. PRICE. 

